linux-kernel - Re: [PATCH 0/3] dmaengine: Stear users towards dma_request_slave

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Message-ID: <CAMuHMdXahPt4q7Dd-mQ9RNr7JiCt8PhXeT5U2D+n-ngJmEQMgw@mail.gmail.com>
Date:   Mon, 3 Feb 2020 21:34:12 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc:     Peter Ujfalusi <peter.ujfalusi@...com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        dmaengine <dmaengine@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH 0/3] dmaengine: Stear users towards dma_request_slave_chan()

Hi Adrian,

On Mon, Feb 3, 2020 at 9:21 PM John Paul Adrian Glaubitz
<glaubitz@...sik.fu-berlin.de> wrote:
> On 2/3/20 2:32 PM, Geert Uytterhoeven wrote:
> > Both rspi and sh-msiof have users on legacy SH (i.e. without DT):
>
> FWIW, there is a patch set by Yoshinori Sato to add device tree support
> for classical SuperH hardware. It was never merged, unfortunately :(.

True.

> > Anyone who cares for DMA on SuperH?
>
> What is DMA used for on SuperH? Wouldn't dropping it cut support for
> essential hardware features?

It may make a few things slower.

Does any of your SuperH boards use DMA?
Anything interesting in /proc or /sys w.r.t. DMA?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds